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(.No Model.) J E SMITH 2 Sheets-S11eet 1.

CIRCUIT CONTROLLER FOR ELECTRIC CLOCKS .ON TELEPHONE AND OTHER LINES.

No. 300,001. Patented Dec. 0, 1884 AM N (No Model.) 2 Sheets-Sheet 2.

J. E. SMITH. CIRCUIT OONTROLLER .POR ELEGTEIG CLOCKS 0N TELEPHONE ANDOTHER LINES. E

No. 309,001. Patented Dec. 9, 1884.

Lil

UNiTnn STATT s JOHN E. SMITH, OF NElV YORK, N. Y.,

ASSIGXOR TO THE GOLD AND STOCK TELEGRAPH COMPANY, OF SAME PLACE.

CIRCUIT-CONTROLLER FOR ELECTRIC CLOCKS ON TELEPHONE AND OTHER LINES.

SPECIFICATION forming part of Letters Patent No. 309,001, dated December9, 1884.

Application lilcd Mai ch 29, 1883.

To all whom it may concern:

Be it known that I, J OHN E. Sn'rrn, of the city, county, and State ofNew York, have invented a new and useful improvement in apparatus forcontrolling electric circuits which are used both for controlling clocksand to r operating telephonic or other lines or apparatus, of which thefollowing is a specification, rel' erence being had to the accompanyingdrawings.

In another application, Serial No. 59,786, filed on the same dateherewith, l have de scribed a method of and means {or setting andsynchronizing clocks connected with electric circuits primarily andordinarily used for other purposes, and on which the usual currents areall of one polarity. In that method I employ polarized shunts which keepthe usual currents diverted from the clocks until the moment arrives fortheir correction, when a reversed current, by its action on the shunts,lets the clocks into circuit, and it not indicating the right timeputsthem into unison with a standard-time piece.

My present invention is for the correction of clocks connected withcircuits primarily used for other purposes, but on which currents ofeither the same polarity or opposite polarities do the usual work.

Briefly stated, it consists in the combinat ion,

with devices for setting clocks by electricity and other electricalapparatus, oi'no 1 i-p olarizcd electromagnetic shunts, which, duringthe ordinary use of the line or lines, keep the several clock-settingdevices shunted, but bring them into circuit for synchronizing theclocks by the action of a rc-enl'orcing or a stronger current than thatemployed to do the ordinary work of the line-or lines.

Figure l in the drawings is a diagram showing my invention as applied to[our similar circuits radiating from a central station from which theseveral clocks in such circuits are to be corrected. Fig. 2 exhibits amodifica tion of the method of applying the bat tery.

The apparatus at central station A. necessary to be considered inconnection with my invention is shown in Fig. 1, in which a is theswitch-board, with which the several. lines, 7) I) b 7/, connect, andthrough which they also (No model.)

connect with the earth or return-circuit c by means of a switch, d. Theother end of each of these lines connects with the earth orreturn-circuit c, as is well understood. Each of the four divisions B BB B of the diagram shows a clock, a shunt, and other electricalapparatus connected in a circuit in accordance with my invention. Thesefour divisions being exactly alike, a description of one will describeall of them. Referring to either of said divisions, c is a clock, 7t istelephonic or other apparatus operated by currents of any polarity, and*7 an electro-magnet of a nonpolarized shunt, all situated in circuit b.The armaturelever 7;, when moved by the magnet 17, makes electricalcontactwith screw 7, and like contact with screw m when moved by theretractingspring n. A shunt of this description may be made by takingsuch a magnet as is commonly used for connecting the main and the localcircuits in the Morse telegraph and adding to it the electricalcontactscrew m, and therefore I make no claim to such ashuntinginstrument. A wire, 0, connects armature-lever 7.: with circuit7) be tween clock 0 and the telephonic or other apparatus, 7t, wire rconnects screws on to said circuit on the other side of said clock, anda third wire, joins screw Z to said circuit at a point between magnet'13 and apparatus 71. Thus wires 0 1' form a shunt-circuit to the magnetfor operating the device for setting the clock 0, while ashunt-circuitto apparatus h is formed by wires 0 c.

The correcting or setting devices applied to the clock are the same asthose full y described in my application No. 89,786, and to whichreference has been hercinbcl'ore made.

Durin g the operation oi apparatus h, and between the limes at which theclock is to be corrected, spring it must have sullicient tension toholdlever 7. against screw m, and thus keep the clock shunted, and at thesame time, it apparatus 7i is a telephone or other inst-rumcnt worked bymagneto and not by voltaic currents, switch (1 connects directly to theearth or return circuit as shown in plain lines in Fig. 1.

To correct the clock, the switch (7 or its equivalent is moved (by handor by a sta ndardtime piece) to a position as shown by dotted lines, soas to bring into circuit Z) a battery, 1 whose current is powerfulenough to overcome the tension of spring a, and thus cause lever 75 toclose circuit 0 s, shunting apparatus 71, and at the'same time to breakshunt-circuit 0 0', let clock 0 into circuit, and set it to correcttime, as fully set forth in Case A.

When apparatus h is a printirig-telegraph or any other instrumentoperated by voltaic currents of any polarity, the switch, battery, andearth or return circuit should be arranged substantially as shown inFig. 2. \Yhile such instrument is in use, the switch (I connectscircuits 6 Z) Z) 7/ to a portion of battery 25, suiticient for itsoperation, and during such operation spring a must have tension enoughto keep the clock shunted. .Vhen the clock is to be corrected, switch (Zmoved to the position shown in dotted lines in Fig. This movementconnects the whole of battery '6 to said circuit, and the roent'orcedcurrent overcomes spring a, shunts the printer or other apparatus, andlets into circuit and corrects the clock, as hereinbet'ore described.

Though I have shown but one set of apparatus in each circuit, it isevident that there may be several sets, and all simultaneously open atedin the same manner. 1' will also point out that if there should be butone shunt and one apparatus 7: in a building, several clocks inditferentparts otsuch building might be placed in that circuitand allotthem corrected as one clock by the action of that one shunt. In such acase one re-enforced current sutlicient to operate the shunt might besent through the circuit asecond or two before the time for setting theclocks, and then at the exact hour a still stronger current sent to acton the clocks with sut'ticient power to correct them.

It will be seen that by the use of shunts with soltiron armaturcs, asherein described, and

operated by re-enl'orccd currents, or currents stronger than thoseemployed for the other uses of the circuits than that of setting clocks,several main batteries may be used on such circuits.

The current for operating the shunts and setting the clocks may beaugmented byshunting resistance from the line, as well as by theaddition ot'battery or increase ot'electro-1notive force, and Iregardsuch shunting of resistance from the line as equivalent to augmenting orrc-cnt'orcing the battery power thereon.

\Vhat I claim. as my invention, and desire to secure by Letters Patent,is-

1. The combination, with and directly in a main electric circuitoftelegraphic, telephonic, or other apparatus, of an electro-niagnet forsetting a clock and a magnet for operating a shunt t'or diverting thecurrent from the clocksetting magnet or from the telegraphic,telephonic, or other apparatus, theshunting-lever.- being in a circuitwhich branches from the main circuit at a point between theclock-setting magnet and the telegraphic, telephonic, or otherapparatus, substantially as herein described.

2. The co1nbination,with an electric circuit employed for telegraphic,telephonic, or other uses, ot a clock, a device for setting said clock,an electro-magnet in said circuit for operating said setting device, anonpolarized shunt for directing the current through said magnet orthrough said telegraphic, telephonic, or other apparatus, a battery forproducing a re-cnt'ore ing or stronger current than that used for theother uses than that of setting the clocks, and a switch for connectingsaid battery with the circuit, substantially as herein described.

JOHN E. SMITH.

Witnesses:

HENRY T. Bnowx, Fnnrnt. lllYNF/S.

